From bcf9b230be6d74c71567fd0771b31d47d8dd39c7 Mon Sep 17 00:00:00 2001 From: Brian Picciano Date: Thu, 21 Jan 2021 17:22:53 -0700 Subject: build the blog with nix --- .../MIDI.js/js/midi/plugin.webaudio.js | 326 +++++++++++++++++++++ 1 file changed, 326 insertions(+) create mode 100644 src/assets/trading-in-the-rain/MIDI.js/js/midi/plugin.webaudio.js (limited to 'src/assets/trading-in-the-rain/MIDI.js/js/midi/plugin.webaudio.js') diff --git a/src/assets/trading-in-the-rain/MIDI.js/js/midi/plugin.webaudio.js b/src/assets/trading-in-the-rain/MIDI.js/js/midi/plugin.webaudio.js new file mode 100644 index 0000000..15a6f0a --- /dev/null +++ b/src/assets/trading-in-the-rain/MIDI.js/js/midi/plugin.webaudio.js @@ -0,0 +1,326 @@ +/* + ---------------------------------------------------------- + Web Audio API - OGG or MPEG Soundbank + ---------------------------------------------------------- + http://webaudio.github.io/web-audio-api/ + ---------------------------------------------------------- +*/ + +(function(root) { 'use strict'; + + window.AudioContext && (function() { + var audioContext = null; // new AudioContext(); + var useStreamingBuffer = false; // !!audioContext.createMediaElementSource; + var midi = root.WebAudio = {api: 'webaudio'}; + var ctx; // audio context + var sources = {}; + var effects = {}; + var masterVolume = 127; + var audioBuffers = {}; + /// + midi.audioBuffers = audioBuffers; + midi.send = function(data, delay) { }; + midi.setController = function(channelId, type, value, delay) { }; + + midi.setVolume = function(channelId, volume, delay) { + if (delay) { + setTimeout(function() { + masterVolume = volume; + }, delay * 1000); + } else { + masterVolume = volume; + } + }; + + midi.programChange = function(channelId, program, delay) { +// if (delay) { +// return setTimeout(function() { +// var channel = root.channels[channelId]; +// channel.instrument = program; +// }, delay); +// } else { + var channel = root.channels[channelId]; + channel.instrument = program; +// } + }; + + midi.pitchBend = function(channelId, program, delay) { +// if (delay) { +// setTimeout(function() { +// var channel = root.channels[channelId]; +// channel.pitchBend = program; +// }, delay); +// } else { + var channel = root.channels[channelId]; + channel.pitchBend = program; +// } + }; + + midi.noteOn = function(channelId, noteId, velocity, delay) { + delay = delay || 0; + + /// check whether the note exists + var channel = root.channels[channelId]; + var instrument = channel.instrument; + var bufferId = instrument + '' + noteId; + var buffer = audioBuffers[bufferId]; + if (!buffer) { +// console.log(MIDI.GM.byId[instrument].id, instrument, channelId); + return; + } + + /// convert relative delay to absolute delay + if (delay < ctx.currentTime) { + delay += ctx.currentTime; + } + + /// create audio buffer + if (useStreamingBuffer) { + var source = ctx.createMediaElementSource(buffer); + } else { // XMLHTTP buffer + var source = ctx.createBufferSource(); + source.buffer = buffer; + } + + /// add effects to buffer + if (effects) { + var chain = source; + for (var key in effects) { + chain.connect(effects[key].input); + chain = effects[key]; + } + } + + /// add gain + pitchShift + var gain = (velocity / 127) * (masterVolume / 127) * 2 - 1; + source.connect(ctx.destination); + source.playbackRate.value = 1; // pitch shift + source.gainNode = ctx.createGain(); // gain + source.gainNode.connect(ctx.destination); + source.gainNode.gain.value = Math.min(1.0, Math.max(-1.0, gain)); + source.connect(source.gainNode); + /// + if (useStreamingBuffer) { + if (delay) { + return setTimeout(function() { + buffer.currentTime = 0; + buffer.play() + }, delay * 1000); + } else { + buffer.currentTime = 0; + buffer.play() + } + } else { + source.start(delay || 0); + } + /// + sources[channelId + '' + noteId] = source; + /// + return source; + }; + + midi.noteOff = function(channelId, noteId, delay) { + delay = delay || 0; + + /// check whether the note exists + var channel = root.channels[channelId]; + var instrument = channel.instrument; + var bufferId = instrument + '' + noteId; + var buffer = audioBuffers[bufferId]; + if (buffer) { + if (delay < ctx.currentTime) { + delay += ctx.currentTime; + } + /// + var source = sources[channelId + '' + noteId]; + if (source) { + if (source.gainNode) { + // @Miranet: 'the values of 0.2 and 0.3 could of course be used as + // a 'release' parameter for ADSR like time settings.' + // add { 'metadata': { release: 0.3 } } to soundfont files + var gain = source.gainNode.gain; + gain.linearRampToValueAtTime(gain.value, delay); + gain.linearRampToValueAtTime(-1.0, delay + 0.3); + } + /// + if (useStreamingBuffer) { + if (delay) { + setTimeout(function() { + buffer.pause(); + }, delay * 1000); + } else { + buffer.pause(); + } + } else { + if (source.noteOff) { + source.noteOff(delay + 0.5); + } else { + source.stop(delay + 0.5); + } + } + /// + delete sources[channelId + '' + noteId]; + /// + return source; + } + } + }; + + midi.chordOn = function(channel, chord, velocity, delay) { + var res = {}; + for (var n = 0, note, len = chord.length; n < len; n++) { + res[note = chord[n]] = midi.noteOn(channel, note, velocity, delay); + } + return res; + }; + + midi.chordOff = function(channel, chord, delay) { + var res = {}; + for (var n = 0, note, len = chord.length; n < len; n++) { + res[note = chord[n]] = midi.noteOff(channel, note, delay); + } + return res; + }; + + midi.stopAllNotes = function() { + for (var sid in sources) { + var delay = 0; + if (delay < ctx.currentTime) { + delay += ctx.currentTime; + } + var source = sources[sid]; + source.gain.linearRampToValueAtTime(1, delay); + source.gain.linearRampToValueAtTime(0, delay + 0.3); + if (source.noteOff) { // old api + source.noteOff(delay + 0.3); + } else { // new api + source.stop(delay + 0.3); + } + delete sources[sid]; + } + }; + + midi.setEffects = function(list) { + if (ctx.tunajs) { + for (var n = 0; n < list.length; n ++) { + var data = list[n]; + var effect = new ctx.tunajs[data.type](data); + effect.connect(ctx.destination); + effects[data.type] = effect; + } + } else { + return console.log('Effects module not installed.'); + } + }; + + midi.connect = function(opts) { + root.setDefaultPlugin(midi); + midi.setContext(ctx || createAudioContext(), opts.onsuccess); + }; + + midi.getContext = function() { + return ctx; + }; + + midi.setContext = function(newCtx, onload, onprogress, onerror) { + ctx = newCtx; + + /// tuna.js effects module - https://github.com/Dinahmoe/tuna + if (typeof Tuna !== 'undefined' && !ctx.tunajs) { + ctx.tunajs = new Tuna(ctx); + } + + /// loading audio files + var urls = []; + var notes = root.keyToNote; + for (var key in notes) urls.push(key); + /// + var waitForEnd = function(instrument) { + for (var key in bufferPending) { // has pending items + if (bufferPending[key]) return; + } + /// + if (onload) { // run onload once + onload(); + onload = null; + } + }; + /// + var requestAudio = function(soundfont, instrumentId, index, key) { + var url = soundfont[key]; + if (url) { + bufferPending[instrumentId] ++; + loadAudio(url, function(buffer) { + buffer.id = key; + var noteId = root.keyToNote[key]; + audioBuffers[instrumentId + '' + noteId] = buffer; + /// + if (-- bufferPending[instrumentId] === 0) { + var percent = index / 87; +// console.log(MIDI.GM.byId[instrumentId], 'processing: ', percent); + soundfont.isLoaded = true; + waitForEnd(instrument); + } + }, function(err) { + // console.log(err); + }); + } + }; + /// + var bufferPending = {}; + for (var instrument in root.Soundfont) { + var soundfont = root.Soundfont[instrument]; + if (soundfont.isLoaded) { + continue; + } + /// + var synth = root.GM.byName[instrument]; + var instrumentId = synth.number; + /// + bufferPending[instrumentId] = 0; + /// + for (var index = 0; index < urls.length; index++) { + var key = urls[index]; + requestAudio(soundfont, instrumentId, index, key); + } + } + /// + setTimeout(waitForEnd, 1); + }; + + /* Load audio file: streaming | base64 | arraybuffer + ---------------------------------------------------------------------- */ + function loadAudio(url, onload, onerror) { + if (useStreamingBuffer) { + var audio = new Audio(); + audio.src = url; + audio.controls = false; + audio.autoplay = false; + audio.preload = false; + audio.addEventListener('canplay', function() { + onload && onload(audio); + }); + audio.addEventListener('error', function(err) { + onerror && onerror(err); + }); + document.body.appendChild(audio); + } else if (url.indexOf('data:audio') === 0) { // Base64 string + var base64 = url.split(',')[1]; + var buffer = Base64Binary.decodeArrayBuffer(base64); + ctx.decodeAudioData(buffer, onload, onerror); + } else { // XMLHTTP buffer + var request = new XMLHttpRequest(); + request.open('GET', url, true); + request.responseType = 'arraybuffer'; + request.onload = function() { + ctx.decodeAudioData(request.response, onload, onerror); + }; + request.send(); + } + }; + + function createAudioContext() { + return new (window.AudioContext || window.webkitAudioContext)(); + }; + })(); +})(MIDI); \ No newline at end of file -- cgit v1.2.3